SPWF01SA Datasheet, PDF (7/16 Pages) STMicroelectronics – Serial-to-Wi-Fi b/g/n intelligent modules

SPWF01SA, SPWF01SC
Pinout description
Signal Name Type
Table 5. Pinout description (continued)
PIN Number
Main function
Alternate
functions⁽¹⁾
Notes
GPIO[14]
I/O
RXD1
I
TXD1
O
CTS1_DN
I
RTS1_DP
O
RESETn
I
3.3 V
Ground
Ground Paddle
BOOT0
I
14
LED Drive, Power
Up
UART Pins
8
UART1 Receive
data input
6
UART1 Transmit
data output
9
UART1 Clear To
Send input
10
UART1 Request to
send output
Reset
3
Reset input
Supply pins and paddle
24
Voltage Supply
23
Ground
25
Ground
Boot loader
2
Boot loader ⁽⁵⁾
5V tolerant
5V Tolerant
Active Low, 5V
Tolerant
Active Low, 5V
tolerant
Active low for 5 ms
with pull up to
2.5VDC. Not 5V
tolerant
Decouple with 10uF
capacitor
Add plenty of ground
vias for thermal
dissipation and ground
return
1. The activation of ALT function depends upon the firmware version or upon the variable configuration.
2. To perform the factory reset of the variables, pin GPIO0 must be high during powerup.
3. GPIO function running when low power mode variable is enabled.
4. Introduced with the release 3.0 of AT Full stack. To enable the STAToMiniAP switch the GPIO[7] needs to be put low
together with the HW reset
5. To enable the firmware download, pin BOOT0 needs to be high during power up. RESETn need to be pulled low at least 5
ms to initiate the firmware download sequence.
PIN 26 to PIN 30 are Reserved and they can be left floating in the final design
Application tip
As a general rule, when commutation issues occur, a level translator should be used to match the I/O
pins voltage of the connected device.
The HOST processor should control the RESETn pin of the module in order to recover unexpected
behaviors using the HW reset.
DocID025635 Rev 6
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